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isset和empty的区别

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Release： 2016-06-13 12:33:45
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isset($var); //为false 没有定义没有定义为假
$var = ''; 
isset($var); //为true 定义了为真
empty($var); //为true 值为空反回真
$var = '111';
empty($var); //为false 不为空返回假 

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empty false isset true var for Fake the difference and definition of
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